BA8400 Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BA8400

CTL recording / playback amplifier for VHS VCRs

ROHM Semiconductor 

Video ICs

BA8400FV

•Measurement conditions (unless otherwise noted, Ta = 25°C and VCC = 3V)

Parameter

Switch position

Symbol Monitor SW SW SW SW SW SW SW SW SW

1 2 3 5 9 10 12 13a 13b

Notes

Circuit current

ICC

Am14 a a a a a a ON OFF OFF

—

〈AGC amplifier〉

AGC amplifier gain

∗1. f = 300Hz,

GVagc Vm13 a a a c b b OFF ON OFF VIN = 50mVP-P

Input bias voltage

VIB8 Vm8 a a a a a a ON OFF OFF

—

Pin 5 input resistance

ZIN5

Vm5 a b b b a a ON OFF OFF ∗2.

AGC control sensitivity

∆AGC / V 13pin a

a

a

c

a

b

ON

OFF OFF

∗3. f = 300Hz,

VIN = 0.15 / 1.0VP-P

Output amplitude

VAGC 13pin a

a

ac

a

b

ON

OFF OFF

∗4. f = 300Hz,

VIN = 300mVP-P

〈Hysteresis amplifier〉

Hysteresis width

∆HysV Vm1 a a a a a a ON OFF b ∗5.

CTLOUT output voltage H VOHP Vm1 c a a a a a ON OFF b IO = – 0.5mA, Vs13 = 1.5V

CTLOUT output voltage L VOLP Vm1 c a a a a a ON OFF b IO = + 0.5mA, Vs13 = 0V

〈REC amplifier〉

Recording current 5

Irec5 Am56 a b b a a a ON OFF OFF

—

Recording current 6

Irec6 Am56 a b a a a a ON OFF OFF

—

Max. output voltage "H" VOHR Vm1 c b b a a a ON OFF OFF IO = – 0.5mA

Max. output voltage "L" VOLR Vm1 c b a a a a ON OFF OFF IO = + 0.5mA

Input threshold voltage

Vth3 Vm3 a b c a a a ON OFF OFF

—

Input resistance

ZIN3

Vm3 a b d a a a ON OFF OFF ∗6.

〈REC / PB switch〉

Threshold voltage

Vth2 Vm2 a c a a a a ON OFF OFF

—

REC to PB switching time TR-P 1pin a ba a c a a ON OFF OFF ∗6.

Measurement method

∗1 Input a sine wave of f = 300Hz to pin 5, and measure the output amplitudes on pins 10 and 13 (Vo10 and Vo13).

The AGC gain is given by: Gvagc = 20log (Vo13 / Vo10) [dB].

∗2 Measure the output voltages Vo0 and Vo.5 on pin 5 when currents of Is5 = 0, and Is5 = 0.5mA are applied.

The input resistance is given by: ZIN5 = {0.0005 / (Vo.5 Vo0) 1 / 400} –1 [Ω]

∗3 Input a sine wave of f = 300Hz to pin 5. Adjust the input level until the output amplitude on pin 10 is 0.15VP-P and 1.0VP-P, and measure the correspond-

ing output amplitudes on pin 13 (Vo0.15 and Vo1.0).

The AGC control sensitivity is given by: ∆AGC / V = 20log (Vo1.0 / Vo0.15) [dB].

∗4 Input a sine wave of f = 300Hz to pin 5. Adjust the input level until the output amplitude on pin 10 is 300mVP-P.

Measure the output amplitude on pin 13.

∗5 With pin 13 floating, measure the output voltage Vocent.

Increase Vs13 from 0V, and record VINH as the Vs13 voltage when the pin 1 output exceeds 2.8V.

Decrease Vs13 from 1.5V, and record VINL as the Vs13 voltage when the pin 1 output goes below 0.2V.

High-side hysteresis width ∆HysVH = VINH Vocent [VP-P]

Low-side hysteresis width ∆HysVL = VINL Vocent [VP-P]

∗6 Measure the currents IIN2.7 and IIN3.0 on pin 3 when voltages Vs3 of 2.7V and 3.0V respectively are applied.

The input resistance is given by: ZIN3 = 0.3 / (IIN3.0 IIN2.7) [Ω]

∗7 Input a square wave of 300Hz, VIN = 20mVP-P to pin 5, and measure the time that it takes CTLOUT to be output after pin 2 goes from VCC to 0V.

7

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